Telephone-exchange system.



E. E. CLEMENT.

TELBPHC'NE EXDHANGE SYSTEM.

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5 SHEET S-SHHET 1.

E. B. CLEMENT.

TELEPHONE EXCHANGE SYSTEM.

APPLICATION FILED JULY 20, 1906.

Patented Sept 1, 1914.

5 SHEETS-SHEET 2.

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E. E. CLEMENT. TELEPHUNE EXCHANGE SYSTEM.

YAPPLILI'IN FILED JULY 20,1906.

Patented Sept. l, 1914.

E. E. CLEMENT.

TBLEPHQNE EXCHANGE SYSTEM,

APPLICATION FILED JULYZO, 191151 Patenten sept. 1, 1914.

5 SHEETS-SHEET 5.

@wimmm 'UNITED sTATEs I IENT CEEICE.

EDWARD E. CLEMENT,

or WAsHINGToN, DISTRICT 0F COLUMBIA, ASSIGNOR, BY

MESHE ASSIGNMENTS, TO FREDRICK C. STEVENS, OF ATTICA i NEW YORKTELEPHONFFEXCHANGE SYSTEM.

Specification of Letters Patent.

Patented Sept. 1, 19]

Application filed .Tuly 20. 190B. Serial Noy 327,096.

To all ywiz om it may Concern:

Ile it known that I.y EDWARD E. CLEMENT. a citizen of the United States,residing at W'aShingtCn, in the District of Columbia, have inreutedcertain new and useful IIuprovements in Telephone-Exchange Systems, ofwhich the following is a specificationY` reference being had therein tothe accompanying drawing.

Ny invention relates to telephone exchange systems and has for itsobject the improvement ot' such systems in the manner which willhereinafter appear.

It is my desire in the present invention to produce a semi-automatictelephone eX- change outfit in which the amount of connective apparatuswill be sulistantially less than that of subscribers apparatus, and itscontrol rendered more certain than heretofore possible.

The. intention may be. briefly outlined as follows: a uuniller ofconnective trunks approximatel)-Y lt) per cent. of the numoei` of lines,is provided, with terminal connections such that a calling line will beautomatically switched to an idle trunk. surh trunk terminatin, Y inautomatic selerting apparatus and haring associated with it certainrelays which pass under the Control of the subscrihcr-v duringconnection. To Work the automatirl selen-ting apparatus` I provideoperators who have automatic switching means` for connecting them tothetrunks when lines are calling hut at uo other time. Ilach operator haslcontrol of one or more. sending or impulse transmitting devices Wherrlrrsuitable imndses` may he applied to the automatr- Selci-ting apparatusto produce any desired connection A rery import-ant feature f theinvention lies in this lse'ndinfs', apparatusE tlu arrangyment of whichenables me to use one common romnmtator or 4'ircuit breaker l'or anentire archange. All the opflattors" sending wheels run synchronouslywith this "oinmlltatnr. and instead tt' havinnr cath r liet-l prmideduith ,i certain numY bei of teeth to malte :in-l l'reak |hl circuit. Iprmide Carli wheel will one unbroken tooth of sullitilid l "j,`ll' lftsluy in the. in

naar

therrnore, there is no sparking at the contacts on the Wheels, all makesand breaks being at Athe main coinmutator, for the rea-- son that themake and break at each individual number Wheel occurs a little before ora little after the corresponding make or break on the main coininutator.Thus, for example, suppose the number 3 is to be transmitted, and thecircuit of the number 3 wheel is therefore closed, the tooth on thisWheel cornes into Contact with its spring pen during the interval ofbreak on the main eommutator, and remains in contact long enough for themain eomrnutator to make and break three times, passing ol' of itsindividual spring during` the third break of the main cornniutator. Thusit will be observed that. all deterioration due to sparking and the kickof coils in the circuits is confined t0 the main commutator which Iconstruct very solidly, preferably with cornpressed mica` insulation anda carbon faced or solid carbon brush.

For the sake of convenience I shall illustrate and describe in this caseselector and connector switches of the type known as the. Strow er, suchswitches being Well illustrated in t e Letters Patent No. 815,176 andNo. 815.321, issued March 13, 1906 to Automatic Electriti Company as'theassignee ot Keith and Erickson. The primary selector and operators trunkselectinflr switches may be of the same generaltype, at least in so faras regards their contacts and the wa;v their contact arms and banks arearrangz-` ln one` particular there is a difference lr.. |n\ rimaryselector switches for answeiing calls do not have any ertieal motionhut, simply rotate. Another point of difference is that I prel'er to usea power drive with a clutch l'or ear-li individual switch. although thisis l matt-rial. and a step by step movement.. prt.- rally driven tromthe main commutator an l lsimilar in every respect to the rotatingrnio-ement of the patented switches i fawniflari' truuk Vig. lod- :didall connection with Fig. l. liig. 3 snows the circuits of an automaticswitch. Fig. lis imodiication of Fig. l wherein the prmary switch isconnected directly to the 5 line.

showing the primary switch connected to the line and the secondaryswitch comiected tothe trunk.

Referring new to Fig.. l. the suhscribers station A comprises apparatususual in cornvmon battery' systeinsonsisting of the trans-4 ;mitter,receiver, ringer-s, condenser and switch-hook. The line wires from thisstation terminate in the line relay M through the normally closedcontacts of the cutoff -relay M. The relay M when energized placesbattery on the Contact am in the bank of the switch Z. This switchvvl'ien not busy;

is constantly rotatinfir being normally vzo nected to a constantlyi'iteting shaft by' means of a friction clutch al engaging the .clutch ewhich is rigidly astened to the4 shaft. This clutch is controlled by themag net Dzu which when energized attracts the arm d2", disengaging theclutch e thus` causing the spindle ZY carrying the wipers` to come' torest. This magnet D2 is ener gized when the test wiper es rests on thetest Contact 2" and the line 1 2 is calling.E and holding relay Menergized. The trunk@ wipers 2* and es? are disconnected from the' trunkWires 30 and 3l respectively by the normally open contacts of the relayD1".` This relay is energized in 4multiple with the magnet l)2O and isheld energized by the ao. -tion of the relay D when the trunk is con-i`-ne'cted to the calling line. The relay D con`y 'nected to the roundedside of battery is tapped to the tip side of the trunk 30 Whilei 40 therelay D connected to the free side ofE battery is tapped to the sleeveside of the trunk 31, thus i'ur ',eshing battery to the call-` ingsubscriber. T relay E is the starting' re ay andtis operated when thetalking trunk is connected to a secondary trunk shown inq the lowerportion of the drawing. This relay when energized locksitself throughthe contacts ea and c* and is thereafter con trolled by the relayDuthrough the contacts al and d. The relays S and S respectively,

each have one terminal connected to the contacts a*e and 25 in thcsecondary switch Z. The relay S has its other terminal connected to thefree side of battery. The relay 5 S which responds to impulses from thesending machine shown in Fig. repeats these impulses over the tip sideof. the trunk 30 to the switching mechanism in Fig. 3. The relays S andS' also furnish battery for the l operator-"s set in the secondaryoutfit and at the same time connect hes' talking set to the trunk Wiresenabling licf to converse with vthe calling subsrriber.

The secondary switch L" identical v. ith that of Z and its magnet D isenergized;

Fig. 5 is still another modilcation'` manner that the magnet Dzojisenergized by `the action of the relay M,j The rel-ayD40 1s connected inmultiple with the magnet` D3". The relay T in the secondary outfit isprovided With'a make before break Contact and through this contact isconnected to. the Wiper 25", When` the Yrelay D4 is operated. 7When theswitch Z comes to rest with its wipers in connection with contactsleading to the talking trunk.l the relays vT and S are connected inseries. T he relay T 'becoming energized locks itself through thecontacts t and 2 opening the contact t thus disconnecting itself fromvthe `wiper' 255 and taking battery" oil1 of relay S. The action of therelay Si closes the contacts s and 8 there!)v completing the circuit ofthe relay E whian remains locked throughthe contacts e and e* and undercontrol of the relay D. Ground is placed on the test contact e3 over thewire 18 when the relay D is energized upon being connected to the lineand 1s removed by operation of relay E. The operation of the relay Tcloses the circuit of the lamp L which is the signalto the operator thatthere is a call. The relay H has its circuit closed when the operatordepresses the starting button Kx' in Fig. 3. This relay in turn closesthe circuit of the relay H which inturn closes the circuit of the motorin Fig. 2. After the operator releases the button K" the circuit of therelay H is maintained through the pen q which then rests on the metalportion of the Wheel Q25, the metal portion being connected to battery.The circuit of the relay T is normally oompleted through the contacts kwand It of the relay H', but after this relay is energized the circuit ismaintained through the contacts 11,2 and ha of the relay H.

Referring noW to Fig. 2 a very important feature of this invention isshown wherein a common impulse generator supplies the entire exchange.individual selector wheels hav. g teeth of different lengths are provideThese teeth are so proportioned and the wheels so run relatively to themain com-l mutator that they will always make and break a little beforeand a little after the circuit at the comrnutator is made and brokenrespectively, which positively avoids sparking at the Contact pens. Thisarrangement is Ashown diagrammatic-ally in Fig. 2 wherein I haveillustrated the main commu tator, one set of number Wheels, an electricmotor for driving the shaft common to all of these, and a set ofoperator`s buttons similar to those used in selective ringing systems ina great many exchanges. L type of button can be used provided that Whenone button is depressed it must be kept locked or. in an indicating.position until some other button is depressed whereupon the Erst buttonmust be released and A nv 1 and Q5 are provided with teeth of ditierentlengths, the tooth on wheel Q1 being the' shortest while that of Q5 isthe longest. The tooth of the wheel of Q1 in passing over a Contact pentransmits one impulse through the medium of the common commutator Q1".The tooth of the wheel Q" in assing over one of these pens transmits veimpulses through the same medium. A complete machine will have teir` ofthese wheels so that any digit from one to ten can be indicated bysending the appropriate number of impulses. In the drawing in order toeconomize space and avoid confusion, I show only the first five wheels.In practise these wheels are all one, the teeth being formed upon thesurface of a drum which can be driven by a suitable' motor or shaft. Thespeed which I have found most suitable for this device and for the typeof switches I here illustrate is approximately twelve revolutions perminute. For a line exchange which I am illustrating the first fourwheels will be provided with three pens and the rc maining six providedwith two pens each. These ens through which the impulses are transmittedare connected in their proper order to the buttons K1, K and K". The pen1 is connected to the individual spring 7.1 ci] the key 7.'1 in the setK1 by means of the wire 74. Similarly the pen y ot the Wheel Q2 isconnected to the spring 7,1 oit the key la of the set K1 by the Wire 75,and so on. The succeeding Wires of all the pens g go to the individualsprings of the keys of theset K1. The second set of springs y2 areconnected in the same order to the individual springs of the keysbelonging to the set K2; the `third set of springs Q3 are shuilarlyconnected to the rindividual springs of the key set K3. The layout inthis figure is intended for an exchange of one hundred lines or less,the two sets of keys K1 and V2 serving to control two sets of numberwheels for selective purposes while the third set of keys K3 is'intended in the present case for selective ringing on party lines.

The wheel Q eontainlng the three tccth transmits what is commonly Calledthe rotary impulses to ail'ect the side switch mechanism in theconnector switch. The impulses from this wheel instead of beingcontrolled by battery through the medium of the commuta- 'tor Q1 sendsgrounded impulses operated directly by the teeth coming in contact with'a single pen.

The wheel Q25 has an insulated point upon which the contact spring ifnrn'mally rests. It' this wheel is started by the operation ol the motorthe pen g riding on the metal portion ot' the wheel closes the circuitof the motor which will continue to run until the wheel Q*5 has made onecomplete revolution and the pcn q again rests on the insulatrd portion.The teeth on the wheel Q are so set that they come successively incontact with the pen q immediately alter the tccth of the impulse'wheels have ceased sending their respective impulses.

The common springs T8 of the key set are connected together to a commonwire T9. This common wire carries to the switches in proper sequence theactuating impulses.

To illiutratc clcarly thc operation olE this ficvicc, supposc it hedesired to transmit over lhe wire Til the number i3. The operator(lepresscs the fourth key in the first set :nul the third key in thesecond set. and finally the third licy in thc third set. Thus the springo" of the whccl tw* becomes connected to the wire 79; the spring q2 olthe wheel Q3 lwcoxues conucctcil through its wir@ to the wire T9. Now asthe drum or the wheels rotule what happens is (his: First, tour impulsesfrom "hc win-cl Q4, thcu a single impulse Yfron. the whcel Q, thcn thrccimpulses from the whccl Q; then ontimpulse 'from the wheel Q; then threeimpulses 'from the wheel (j, and finally u single impulse from the wheelQ, to crnuplctinu thc signal. Any one familiar with the Strowgcr .systemot' switcher: will at once pcrccivc that the wires i9 and Si can bcconnected directly to thc vertical and the rfuury siclc of a switchrrunlr, rcspcctively, :nul the impulses will thcu serve to oper-atc theswilchcs pcrfcctly. I may here static that thc sole function of thewhccl Q25 with its wiper f7 is simply to send in one complete set otEimpulses and then stop. Obviously, if the operator sets up the signalltcys :incl the impulsos were permitted to go dircctly into thc switchcircuits' without any .slartingir point, great confusion would result..For this rcason l have the various signal wheels always come to rest ata normal starting point which is controlled directly hv the wheel Q2 andthe pen ([6.

lThe circuits of Fig. l thus iiescriluul are particularly :u'laptcd tooperate with the trunk circuit 1shown in Fig. il.

Referringr now to Fig. il the connector switch consists of thc verticalrelay V which respondingy to impulses over the vertical Side of thctrunk operates thti vertical magnet V2 which iu turn causes the spindleZ carryilngr the wipers` e and e to step up vcr tically. Thc relay V'connected to thc rotary side of the truuk responds to rotary impulsesand operates the private relay U llO which in infn @more libemechanically op- (grnlod fliiio mvlllll-HU nuwe 011e IBODQ l1S- connect'ig the vertical magnet V2 and in itsA i rv conneohing' the rohary magnetV3, nml the come time through the side Swich mao conocer;y thetip sideor olie trnnli': no a contiict in the private relay which, whencloserrl, connecte the test relay J". The relny l'rea-ipcnding to a.second set oli inry piilieeo over the ertifnl side of the troni;opernteetile rotary magnet V3 canning the spindle Z te robee morilering#` the wipers to rei- 1t on contacte lending lio the deired line.The next rotary impulse coming in operates `the 'grivnc relay dl inthecome nmnner us he ore` causing che ei/fie switches to make #till hnothermovemene. This lust movement oflthe side swillihe lisconnechs the rotarymn'gne'annl in iis piece connects the rclny ll' which, when operated,closes,y the circuit of the locking* relay X which completer` thecircuit of the ringing relay Y. The relay R now in position to becontrolled by the ihird ot impulses coming in over thc ver'isgni side ofthe trunk. This relay controle n set o relays W' and4 these ivlaye inturn control generator cnrrcnt ol lliiicrenl iiwincricies orpolslrities. All of these ve; :im eelilocking endl have :i commoncontrolling their lockK ingr circuito. This common Wire, ll), leilfle to:1 noramilly open mutuel in the relay X. This relay hol-oclug energizedat the first' impulse of l'lw iiiiril Set places battery on this. wi c.'ihr relay l is also energized in this iimfiiirr :imi miler the firstimpulse its armatore drops linck and clones the eircmt ci" lw voley ll"through *rho normally cimeli comincio of the rclny W5. rllic nextinilnllw` optonline the relay R @losen the ciu-nii of rin relay Wthrough the contarte; ol flic relay W :mil the normally r-locvcl calnameoiIi the relay lV, nml after the ow x o the I"irvuit contenir ci' the wikwel through the con ilu-i fw] i l .it the third impnlec lilo wi yl-i inclosell through xyzil .finti "W0 und omini-is oi' the relay the iiirilimpulse the W* is closed tl'irough amil W7 [Uhl loswl commi.; of therelzly Hui u llw relay illu Mahlow oi' tin- I'elnys il the normally ly".'.f\t llw i'v-nrlli iinpoiec lli circuit of ll'n relay lll in vlorioiiiliiongli ille ColltzlCtS if iiic il-lnya VV. WC" nml il, It will liesven from the foregoing :ii-criplion that I lmic :i set of Riep in'iegrIk inlay controlled lay the relay H', the fir-s1'. rel-ny of the Hetilevoniiligf energized when ii@ relay R be veines ilcinergizel'l. thesel-cnil relay becomes energized when the relcy R' becomes energizwi theHeiunil time, :ind the third Vrelay becomingr energi'fzm when the relay-R again hommes enrgizcil, om! so on.

Batterv is supplied to the called Bubscriber through the relay R and`retardation coil l1 which are normally connected 60th@ rollin end oilthe trunk. The locking circuit o' the relay X is controlled jointly thenormally close-d contacts of the rela. emi the normally open contacts-z3an z2 c ontr:lied by the spindle Z. If the called :whscriher answers,the relay R becomes energized, disconnecting the relay X' which in turncuts oil the ringing relay Y. 1f the vullen3 subscriber d'oes notanswer, the relay X ie disconnected' y,when the calling subecriier hangsup histelephone disconnecting` the switch Z which upon returnin isnormall position opensthe contact springs c2 and' e. The callingsubscriber 'at the enel of the conversation automatically places butteryon both sides of the trunk circuit bperuting the relays V and Vsimultaneouch@ the fiction oiwhich closes the circuit of the test relayJ which in turn closes the circuit of the release ma. net J. Battery isplaced. on both sides of t e trunk circuib by the combination of relaysin `the talking Girenergized which places battery through its 195normally closed contacts to the conm-'cts in the relay E and fromh thereto the trunk circuit. The next relay to drop back or to heroine(lenergized is the relay D which l :lo nt of being in Series with theline cut mi @hay through the primary selector sets. A iter the relay Dbecomes denergized the roi-.w lie disconnected and thus battery isrelnfsoil 'from both Sides of the trunk.

Referring now to Fig. 4 instead of providing' earch trunk with e primaryswitch I connect one of these switches to each line and instead of beingconstantl rotated, it is normally at e standstill an only starts torotate when the subscriber closes the line circuit hy removing hisreceiver,-` These Switches contain contacts leading to talking trunks.When the line relay M is energized, the magnet I)20 has its circuitcompleted and drawing down the arm d,` the clutch am engages theconstaxtl rotating clutch. therebyV causing the spin le a earlying theWipers to rotate until an idl ent energized longer than the relay D on110 multiple wire leading to the conter-t 20 is -connected directly tobattery through the normally closed contarte ol' the relav D. Thisrelay. when idle is, of course eenen gzed and when busy is energized andnat tery is disconnected from the test ruutarl zu". Then this trunk isbusy. the (lilies-eure of potential at contacts 2N" is such that a testwiper on any other switch in passing over one of them will not cause itsrotoli relay M to be operated. To inake this clear I will describe themethod ot operation which is as follows: the subscriber, u-nioring hisreeen er, closes the circuit of the relay M which, attracting itsarmature. cluses the circuit of the magnet D2U causing the switch torotate. l'rwhen the wiper 33 xnalics coni'iection with a contact leadingto an idle trunk, such as is shown in the aceonulanying drawing, therelay M ini .aaliately gets di; ct current from battery l5 rough thecontacts d* and ni; The energi/.ing ol' the relay M by this pathdisconnects the relay M and connai-ts the line wires 1 and 2 to theextensions 3 and 4 respeetively. and as soon as this happens, the relaysl) and lil become energiz-:ed through the subscriheifs station. Therelay D is prorideu `with a srt of malte before hreak contacts and uponoperating, disconnects` direct` battery troni the relay Mby herebreaking the contauts d* and d, but at the same time it closes thecontacts Z5 and d. The resistance coil l is connected to battery and tothe what il, and the relay M is thereafter held oul ergize hy ein-rentllowing through this coil` It ol course follows that the test wiper ofany other switch in passing,lr over this rontact .216" will not operateits associate cutoff relay. The balance of the eireuit and the operationol' the saine is identical to tha Shown in Fig. l and need not hedescribed.

Referring nor.r to Fig. l hare shown a switch connecte'l to each line asin Fig. 4, but instead of having the secondary switch connected to asecondary outlit` l have it connected to the talking trunk. in this vasewhen ground is ronnected to the sterlina wire lo by the relay D thecircuit oi the magnet D3 is closed. and noon operating draws down the:il-nula" Causing: the :un itrh to rotate. Then the wiper 25"' lindas anidle secondary outfit (which would have battery Connected to the Contactan" through the reh lay T) the relays S and T will be comitati-l inseries and the relay S operating the relav .E in the saule manner inFig. l dieronnects gri-'ouml from the starting u'iffo it therebyrpeningr the Circuit ol' the nua'wt Dt causing the switch to coni'A torest. The balance ol' the circuit and operation is identical with thatol Fig. l and need not be deserihed here. lhese two Fips. i and 5 aresimply modifications of Fig. 1, Fig. l

t :ing the preferred form. These rations modifications are shown so asto fully @over the lill'ereut methods of connecting a eallini,r line toa talking trunk and thereafter connecting the talkingr trunk to asecondary tattili 'oithe purpose of completing the f r num-tion throughfiniti-hing mechanism on the falling' end or tltfe talltiruf trunlf.

I will now describe the complete operation tracing a connection from thecalling to the called subscriber, assuming that suh- -r-rll.ler Lin Fia.fl is the calling subscriber. ll'hen he takes down his receiver, lineeircuit l and 2 is closed and the relay M is energized. The energizingot this relay places battery on the Contact .2'0" through the el: wing:of the contacts m. and m. When the teelt wiper al" ot' the iuuniallyrm'olving switrh Z reaches this` contact. the circuit of the magnet lf2"is closed @rough the conlaute` Il aud d* of the relay l) and at thesaine time the circuit of lha relay l)10 is closed in multiple with thismagnet. The iuergiziug ot' the magnet lili draws down the arm d!"separating the two clutches al and al causing the spindle s2 carryingthe wila-rrV 5" and 55' to corne to rest. The energizing of the relayll" closes the contmls if and all and ff and d thereby conuertiuuj thetrunk onto the line extensions l and l. The relays D and M are thusplaced in `series and the energizing1 of the relay M disconnects therelay M and reuiorcs battery from the test Contact am. As soon as therel-.ly M is operated, the relay l) liffuue-\ enorgijimal through thesubscriber`s` stallen] and attracting' its armature maintains therire-uit of the magnet D2" :unl relay l through the Contacts (Z2 and da.The energizing of the relay D places Iground on the starting wire 18 andContact 5? through the nornmlly closed contacts e :ual f ot the relay F.The wiper 235 of the normally revolving switch Z on reaching thiscontact closes the circuit of the magnet D. llhe energizing of thismagnet draws down the arm of a" causing the spindle earryiugf the wipersto come t0 rest with the wipers on contacts leading to the callingtruuk. The first thing` that happens is that f relay 'l' is connected inseries with the relay by the following path: battery B, 29, 452, fr,in". vl1. '.l, t2, t. 40, armature and contart of relay D, e, 5", S toground. The relay 'l becoming energized looks itself through (heeontarts t and t2 and opening the ronlacls and t2 rennving itself fromthe nire llll so as not to interfere with impulses that are to hetransmitted over thit wire. @le relay' S being' momentarily energized.attracts its armature and closes the circuit of the relay E by thefollowingpath: battery ll. 2S, 2l, s, s', 20, E, 15, d, 5d t0 ground.The relay E thereupon loeksitself through the contacts e* and e3 as thev e011- tact c* is connue-ted to tlurwnding .whlthe 1, The''s sei, @fimpulses tu by fue will! are those transm weA smb

:um fringes Hw wehen; if;

s h# mamy by the pen which causes thc side switch to move one step,dwing the various arms, w50, w60, 107, and wou llic l.uid cmu'acts. Themovenient of the arm vom discl nects the vertical n i il Y* und in itspl- 'fc connects the ro- 'ist Y, while lhe operation of the arm u;connects or placa"` the test relay J' iu yosiiinu to test the lin sideot the linc. 'lhs secr nil srt ol' impu numbering three, operator; tlzcit 1y Y which iu turn closis the wirf-uit o? the rotary magnet V3causing thel spindle .'l to .rotate and bring the Wipers to rest oneontscts leading lo the desired line. "l ne secon-'l rotary impulse noucoming in operatie the relay u nich closes the circuit ot tin priruierelay l causing thc side suillxh to take another step bringing theswitch arnu; to rest on the third contacts. During this second rotaryimpulse while the relay l" iz energized tbc tesi relay J' is connecteddirectly lo the tip side of tbc line and il ille. lixul were busy therelay J would become energized and closing the circuit oi thc releasemagnet l restore the switch to its ncruuil position. Vile will take itfor grant ed that the called line is idle, so therefore the su iii ilarms rest on their respective contact, llic switch arm w50 disconnectsthe lrotary magnet Y and in its place connects rho relay l. The switcharms 'ww and um close their respciiflire trunk circuits while the switcharm wi" disconnects the test relay from the tip side of the line ortrunk. The calling: subscriber is now connected t0 line number 'll.rlfhc third ol impulses now coming` in operate the relay V which in turnclosesy ilu; circuit of the relay It. The rst one lli a: impulsesaffecting this relay causes it to close the circuit of the relay X bythe` following path: ground, p2, p3, X',

320, p' 2109, to battery B. This relay now locks vu i-ll' through thecontact the contact a il' infr connected to ground through the sin" 5sand .e3 which are controlled by the ich spindle. The winding of therelay t connected to battery throughthe norm-.illl used contacts 76,76of the relay R. Battery Iuur placed on the locking contacts of tluinging relay set W through the common wir l5() and the contacts m2 and111:a of the relay el The number of impulses in this last set `are threewhich correspond t0 .the ringing number of the desired party.

The tiret impulse affecting the relay. R

does not a liefst any of the relays in the ring-` ing set Vr", but innnediately after the first impulse when the relay R' drops back'thecircuit oi' thel relay W* is closed by the followingpath: battery B,309, m2, p",-p",

315, if rc2 104, to ground. The second nnpulse coming in operating the-relay R' closes the circuit of the relay W5 by tlie following path:battery B. 309, $2,192 p5, :l1 t. l uw; uw, W5 to groundf The operationof the relay ll disconnects the first generator and connects thegenerator G in its place to the. normally open Contactin the ringingrelay Y. Immediately after the sei-ond impulso the relay R dropping backcloses the circuit ot the relay WY through the patll already describedto wire 315 and trom there through la', w, lwa, w", W, to ground. rl`hethird impulse coming in closes the circuit of the relay lV7 through thepath already described to wire 311i and tron: there through en, wf, fw,fw, fw, w22, W1, to ground. The operation of the relay W1 disconncct/`generator G2 and in its place conne( ts t c generator G which is ofproper frequency or polurityto ring the bell at the desired station.Immediately after the third impulse the circuit of the relay WE `isclosed in a manner similar to that already described in (connection withthe'other relays. `The proper generator current is now placed on thecontacts in the ringing relay Y. (lne terminal of the relay Y isconnected directly to an interrupting machine Y and the interruptingnchine itself is connected directly to batte 1. The other terminal ofvthe relay is connected to ground through the normally closed contacts pand ,112 of the relay R in series with the e011- tacts :r4 and m5 of therelay X. lVhile the ringing impulses are being sent and the proper relayin the ringing set 'W is being selected tlhe relay Y is not afected onaccount of the rapid making and breaking of the contacts p and p2. Afterthe impulses have been sent and the relay R is in its normal positionthe circuit of the relay Y is closed and opened through the interruptingmachine Y. W'hen its circuit is closed the relay -Y opens the trunk andpla/ces generator current on the calling end of the trunk. y Thiscurrent is placed on the line intermittently and during one of theseintermissions when the relay Y is denergized` and' the called subscriberremoves his telephone the relay R becomes energized and opening thecontacts p and p releases the relay X which From the foregoindescription it will seen that the two su scribers are provided with aclear talking circuit,` battery supplied to the called subscriberfron'the connector switch and battery supplied tp the calling subscriberfrom the trunk. In this present arrangement there are two sets ofcondeusers in this talking circuit and also an additional b'ridgecausedby the relays V and V which arernot needed at this junoture. The relay Xwhich is released when the called subscriber answers also unlocks therelays in the ringing set W thus pre ventd ,l

anismthrongh the contacts e, @i me l, i',

The relay l)7 is the next relay to ls-op thereby releasing the rela,battery from both siA o this combination it will be seen that nmomentary impulse has been placed siinnltnnea ously on both trunk wires.Referring; now Y t0 Fig. 3 `this momentary i ipulfie oper-atea' thetrunk..

the relay J by lie following: will J1-vwl 1 l* o, eg', J', batik-try B.This lutter relny o ating closes the contacts j :ind j energy.

i the rela s V and V closnxv the (1n-ruit oi f! :mii fi enmiwmney mme@rolling, @merli iinlii'lliuu lo signi operfrtors nn':'inn;.i..n3arranged in be automatically '1i 'rj to roi-neet its woche-l operatorieL m zrli lie link f'izvnit :iwal-cimeli willing.: line und ilwrobyassociate i im Gmini-rdiff l lin@L menne Ver Jionmiir Siri. to n' :mh

the release magnet .l thereby restoring-j 1 :n vwnwwbion if .my treni;to n switch toits normal pozition. l lo iwi ijn, Mim; :mil runner-g; Bythe term continuously rotzsi'el i mii Llwrvto Suk applied to theSwitrliing Ineens in trie wg:- wi'fmziseljf 11e alwefribil. l pendedclaims, is meent @Mitch-:1a luii'injgi 3j. ln f. *gluem No Sysgtem, :ieither or both of the following :.-lmixwiwl ylvonlity e! hui-: lim.ymllalitv of istieull) :i uniform motion o!" revolution wcnwwiw .wirvim-mw. :l douille .mit nlV of their Wipm: about the :ixirsof llirspimlul :wtmmlr wiffiw .losmiil linie. the l1.|' 1`.` :is distinguished from:L StepJvy-stzjp nuwel mi nflnp'wl ,to mom I; i-.illlilgl linee` therenient about the eine axis, Mul iziespwrme un :um il Si mi zu (oY'runner-tl the 0f Whether the smid uni'fn'ni num-nient lm helm 1.@ :anrqmrntors Set Continued for tlm pmwl @wir ilu twir wir; W1 Hwdmnismation only or eiftnim-l in u MHVM.) n, l'u son U l'iofl; (2) u switchingo wars Le U Step-bylsep motion or otlu-iiiiee :ein i, i in the Sameangular direr'tion, the wel mieli having no normal or zero poe'ition:rml von- Sequentlv; no release derive 'for iotiu-iing ii. to thatposition.

l do not herein clzzini txihvadefl. trunks or secondary distributingnieuw io ators controlling devices baicnily or ,g cally, inasmuch as thebasis; rml claims to this Subject matter are malle 1n copemlingapplications of mine disch g other species of' my invention mel illenumbers `and filing lates of wl'n l an; follows: Serial No. SELQVM.filon s pril 2.4)', 1907; Serial No. 383,874. filed Jnlr I2.

1907, and Serial o. 1907. v

Having thus described my invention what I claim and desire to Securelr-ttere Patent is:

l 1. In e telephone exchange system, a ,elw rality of line circuits, a.plurality of link eircnits for interconnecting the emile, n double setof automatic s\vit .l1es.= afm-,interi with seid links, one set adaptedto effect initial connection between links and lines, and the other setto be .driven in a determined manner to tlle `wanted linee.y mchenismsida ted tobe controlled by en Ofelatl 1012 fleeting the Second Se* etluitlw, zflilml tu muli operatori-i mi fmitr'li i- .wl mul martinmlmilly:ir-main! uilen :1 lin!U r' wwuwiiizi @lise tx'nn illm "'li opvrntmslcow enti untoreir-it fl sie cme il): mi wt nini s emitrolv the opm'etorsto the Hunks, aemeztnnrnilly e dewrzibelfl..

Vin :i teleplusne exeliswge Systmn, :i plurality of iler: dimite, :iplurality of mnneetia'e inutilr therefor less in man1- i ler than the il 0;' oi lines, a primary 1to1* Switch erw-ii l*rnnlr mluqjrteel reconnect the funk 'e a Calling l 4 wie, seleetor switch conemtnting theconm -ting or ceiling' terminal o the trunk, an operations nnswe nag undeontmiiing set, 'wd :i continuera@ rotated eecomary selector switchindividual to set for connecting the same t the trunk,

.. substantially as descril'` l.

`6. In a telephone exchan e system, a 'lurality of line circuits, anunber of trunks ess than the number of lines, automatic switches forconnecting calling lines with 4the trunks, automatic switches forconnecting thetrunks with wanted lines, operators impulse transmittingapparatus and telephonepsets, continuously rotated secondary selectorswitches, one individual to each operatos set-for connectingtheroperators devices with the'trunks, and switches controlledbyoperators for connecting the impulse transmitter to said trunks,substan- 7,. 2111' a telephoneL system,

tially-as,described.'-

a plurality of line circuits; aplurality of connecting normallycontinuously driven autov matic switches `for connecting said linksother automatic switches to wan .ed lines; `contro ling vde- -to callinglines ;A for "connecting said links operators answering and ticosadapted zto ,determine `the operation of the secondfset of automaticswitlc es, and

automatic switches for connectin Saidf to said operators answering` an,controlling devices,.substantial1y as describedi; Y

M8., In a telephone system, a plurality of line circuits; a plurality ofconnecting trunks ;n normally continuously driven auto- .matic Vswitchesfor connecting `trunks to -calling lines; automatic-selective switching"devices for connectinv trunks to wanted lines; means controlledl by anoperator for actuating said selecting devices; and automatic switchingdevices for connecting said operator-controlled means to a trunk uponsaid trunks being connected to a calling line, substantially asdescribed.

l0. In a telephone system, a plurality of line circuits; a plurality ofconnecting trunks; 'normally continuously driven unto- Inatic switchesfor connecting trunks to calling lines; automatic selective switchingdcviccs for connecting trunks to wanted lines; means controlled by anoperator for actuating said selecting devices; and power-drivenautomatic switching devicesI for connecti saidoperator-controlled meansto a truii said operators said trunks being connected to a calling line,substantially as described.

11. ln a telephone system, a plurality of lines, a pluralityr ofinterconnecting links therefor; means or connecting a calling line toone of said links, selective switching means for connecting u link witha Wanted line, a plurality' of operators sets comprisinr telephones andactuating devices for said selective switching means, and normallycontinuously driven automatic mechanism adapted upon connection ot' alink with a calling line to be automatically actuated so as to vconnectsaid link and its switching mechanism with an idle operators set,substantially as described.

`1:2. ln a tele-phone system, a plurality of lines; aplurality of links;a plurality of opcrators controlling devices normallydisconnected fromthe links but associated therewith; means for connecting a calling lineto one of said links; normally continuously driven automatic means forcausing said upon link to connect with an idle one of said operator`scontrolling devices when said link becomes connected with a callinglline; and means responsive to said operators controlling device fprconnecting said links with desired lines. substantially as described.

i3. In a telephone system, n plurality of lines; a plurality of linksing said lines; normally continuously and mechanically driven automaticswitches for connecting one ci' said lines that originates :l call withan idle one of said links; :i plurality ol operatorscontrollinginwliuoisnis; auxiliary automatic switches ior enabling; :llink so rlioserrto bc sclectcil and connected with an idle one of saidcontrolling mochar nsuls. and means responsive to said controiliugmechanisms for selecting a wanted line and connecting said .linkthereto, substantially as described.

ll. ln a telephone system, a pluraliy of lines; l a plurality of linksfor interconnecting said lines; normally continuously und michnnicallydriven automatic switches for connecting one ci said lines thatoriginates u call with on idle one of said links; a plurality ofopcrutofs controlling mechanisms norm-filly disconnected from :nidlinks; auxiliary automatic switches. one lndivirlual to cach operatorscontrol mechanism,E for enabling a link so chosen to be sc-l lectcil andconnected with an idle our ot Y said controlling mechanisms; andswitching devices associated with said links, responsive to saidcontrolling mechanisms for connecting said links to wanted lines,substantially as described.

15. 1n a telephone system, telephone lines; trunks; automatic switches;each trunkterinitiating in the wipers of an automatic switch. the saidlines hein multiplcd through a plurality of `sai .automatic forinter-connertlili -llO

fl 2 'a switchen` and aipearing as waiting contncbl in said automaticswitches, and enfvh of Said automatic Switol'ies inning n wiper shaftcuri-ying the wipers of that Switch; am auxilifiry conductor for euchline and terminating in n uiting contacts associated with tho waitingContact terminals of the iine; am inixil inry conductor for u trunk sindterminatingy in a, Wiper :issue-interi with the wiperS of the trunk; a.source of continuous power; -1 Clutch connecting Enid source ofcontinuous power and ihr wiper shnf oi the avtomatii: switch of thetrunk: and in elect-roinngnei; having its armature associated with thesaid clutch and having its helix associated with the said auxiliaryooi'irincior of the trunk, whereby the clutch muy he operated by theengagement of the Wiper of the auxiliary trunk conductor with a railingerniinnl of the line auxiliary Coudurier,

16. lin n telephone Syn ein eloplimni iinesg trunks; automatic switchesnach trunk terminating in the Wipers of :in automatic smi-rh. the sindlines being nfmltzipied` through a plurality of sind automatic Switchesund appenring :la waiting cont-mits in saisi nainn'mtic switches undeach o? sani zwtonnitio switolies having' n wiper slaaf' Carrying thewipers of that Switch; an nu net having in` :immun-e :issnointeci withSifiiii clutch and inwing its helix in circuit with the Suid :imiilnsryronehietor of tlm i'niiii; and menne whereby mid eleoronmgnei may heenergized wiiun snifi :mxiiiary 'onililaor :nukes rleotrimi -ziinnecionthrough its wiper itin-lilo waiting roulant oi" thv :umilinry conlllntorof :i (":illing lineq slilmtnn g r i animating in the .vnznrn of :in:iutonnitlc lizilly :as described,

lTv [n :i teirplione Hristrn'i.teirpliono imma; rnnlni; niio'lnntiaKsriitrii fach iriink tow ininniing in the wipers oi' nn automaticswitf'li, the mili lines lining nanlipieei through a plurality of evilnit-matic nitriies nini iippmn'ing in, nailing commis in saidnnioniriiio enfin-hem and rau-ii of said automatic switelios haring i1wiper shaft carrying the wipers of that switch; 2m nunilial'y eomlnrtorfor rin-ii iine. imo {erminnting in waiting mutuels iissmziateil withthe waiting contant terminale of' ihn line; an auxiliary oonriln'l'orfor :i trnnli :md terminating in n wiper n,-.so i:itol with the wipersof'Lho trunk; :l nourri of minimi-mie power; grlutrli erinnerung smulnonni or continnoua power :mil the wiper slml i tile automatic switch sino trunk; ai! eine ourne of rontinnonb' power: L

l l l l i l i inf/egim tronmgfnet having its arnnitnre associated withfluid dutch and having its helix assor'iiiteo with the said auxiliaryConductor of tho trunk whereby the eleotromngnet may be operated tocontrol the clutch by closure of proper circuit from the wiper of thetrunks said nuxiiiary conductor; and other circuits inliigited tocontinuo the operation of said eiviziionnignet fleiu-fnrlently upon thecontinusinei of lie Ciiliing condition upon the tele phone line liennnwiciexeil Wit/l1 the trunk through the wipers ami (fontaine of theal1- tmnniiio switch, snbntantiifilly as described.

18. 1n a telephone system, teie )lione lines; trunks; automaticswitches; enc 1 trunk tex'- niinnting in the wipers of an automaticswitch, the said lines being lnultipleii through il plnriility of Sani]:iliionmtic ewitches and appearing 11S waiting contarte in nani nuto#innlnin switches, and einen of sind 'nntomntlc Switches; having :i wipershaft wirrying the wipers of that switrh; un auxiliary con# iniciar foreaf'h line und terminating in winning contarte associated with theWait.- ing Contact, terminals of the line; an auxi1- inry ':onducior forn trunk and terminating in a wiper associated with the wipers of thetrunk; a source of rontinuous power; a Clutch connecting said source ofcontinuous @inver :ind the wiper elnift o the :into- :nqnf fin-itch ol"the, twink; :in rlrirtroningnet ixiiingg irs nrnafiin sissorfiutefiwiill the .said ilnirlV nini inning itis helix aseoeieeii -with il'siii-fil :auxiliary rronilnntnr of the trunk winni-hy the eieetronnignetnniy he operated contini the fluir-l1 by ceioeui'o of proper n from thewiper oi' the iannli's said rij Condnnlzor; sind menus for noniinunggiiie ognfmtion of sniil eecli'oxnegnet ilepenflontly upon ihr:continuanre of the 'Jiliing Condition upon lie telephone line Then iminted with the rnnk through ille wiiziere nini contars o? the nmoinniic:writeln siiiififinnnlly :is eiesurilieifi.

lil. in n ieieplione n vtein; telephone fines; trunks; automaticswiuhes; Carli trunk tei switch, the said lume lining mntipled through niinriiiitjv of Sani aritomntio in waning contacts associated x 'hitlwniling rontaci; terminals of the vMine;

iiiuilinry r-oniiiictor for :L trunk and termin :uiting in :i Wiper:wsofiutml with the wipers o5 lni trunk; n nmirro of rontinnons power; ec'filltrll connecting Said smurf-c ol= Continxb omi power nml Un* Wiperrsiiuft. of ille mitonmie Mvitnli of the ilunk; :in elects-mung ne?,having its nrmntilro associated with the miel clim-li and having imhelix in vii-ruit with Ilw Suid auxiliary ionlllutirir ol' the from theother terminal of said source of current to the auxiliary conductor ofsaid line when said line is ceiling, said two conductive paths beingconnected when the link wipers are in connection with the waiting!contacts of the line when calling whereof said electromagnet may beoperated to conl trol said clutch to stopthe VWipers upon the contactsof said line when calling, substantially as described.

24. In a telephone sistemi; en automatic switch having movah wipt-rs andfixed waitin?` contacts es parts thereof; o telephone ine havingspeechcircuit conductors and an auxiliary conductor terminating inwaitin contacts of seid switch; a connective lin circuit terminating inwipers of seid switch; a source of power; e clutch adapted to connectsaid source of power to said wipers and wherethrough said wipers may becontinuously driven; an electromagnet controlling said clutch todisaeeociate said source of power from said wipers; a souroeof current;a conductive path extending from one terminal of said source of current`through said electromagnet and to a wiper Ain said switch makingconnection at intervals with the auxiliary conductor of said line; cconductive Path extending from the other torminal o seid source ofcurrent to the aux iliary conductor of said line when said lineI iscalling, said two conductive paths being connected when the link Wipersare in connection with the waiting,r contacts of the line when callingwhereby said electromagnct in uy be operated to control said clutch tostop the wipers upon the contacts of said line when calling; e cut-olfrelay associated with said line sind controlling the current path fromthe source of current to the auxiliary condoctor of' said line, said athbeing inten rupted ae a consequence o the encrgizction of said cut-olfrelay; and e relay associated with seid link and adapted to control theenergization of said electromagnet subsequently to the operation of saidcut-oil relay. substantially as described.

25. In :i telephone system; nn automatic switch having movable wipersand lin-eli Waiting contacts as parts thereof; :1 lehphone line' havingspeeclrcircuit conductors and an auxiliary conductor terminating inwaiting contacts of said switch; a connective trunk circuit terminatingin wipers of said linvitch; e source 0f power; a clutch. adapted toconnect said source of ower to said wipers and wherethrough sind wipersmay be continuously driven; nn eleriromugnet controlling said clutch todis: senciate said source of power from said wipers; a source ofcurrent; a conductive putlz ext/ending from one terminal of said sonrccof current through said electromagnet and to n wiper in Srrid Switchmaking rouncction nt inter vals with the auxiliary conductor of midlline; e conductive mth elcniling from the iothcr terminal ol' SuidSource of current to the :auxiliary conductor of will i'nc when scidline is, Polling seid tiro conductive paths being roiiucciod when ihrtrunii wipers are in connection with the wailing' contacts of the linewhen railing wharf-why :wifi electro magnet may lic opcroteii to controlsaid 4vlulch to Stop the ui'igune upon thc contacts ci Suid lint-1 hunrailing: :it cutoff relay 'neeocinterl n ith sziizl liuc und controllingthe current path iron; the sour-re of current to the auxiliary conductorof acid line, said j path being interrupted :is :.i consequence o theenergization et said cui-nii relay; und means for controllin thcenergization of jsriid electroniagnet eter the operatitjp of LSeidcutoff relay Suhstcntinly descrlbed.

26. lu o telephone System, :in automatic primary ecirc-tor Switch: inautomatic coIr tinuously rotated secondary .eciector switch: n lineappearing in waiting connu-ts ci seid primary selector vewitch; :i iiniroipeoring in wipers of Said primary Scio-lor mriich :md in waitingcontacte of Said Secondary selector switrh; menne for stopping thewipers of scid prinniry Selector Switch in electrical connection with aculling line; menus for topping the wipers of Suid secondary selectorswitch in electrical connection with the waitin#r contacts of seid linkwhen prinmrily conncctml with will line, Selective :nouns adapted tocouncct the link with wanted linee und an opcrntoi"s set associzatw!with Huid lwcondary Selector switch and cnuiprisng :1 telephone :1ndactuating means i for :mid liuc Selur-l ing menne. substantially asdescribed.

2T. In n telephone syslcnn nu nutonmtic prinmry selector wwitch: on:mtonmtic ron- Linuously rotated secondary schw-tor Switch; a lincappearing in Waiting footnote o'f miel primary selector senin-h; n trunkappearing,r in wipcrs of son] primnry iscector switch und in unitingcontacts of miei scconi'lery selector switch; u source ci current; orelay associated with .Huid liuc :Hui mluptcd `to connect one terminalof :mid source of current to tho tesi terminal of nid iinc in Smidprimary ssi-lector Switch; und .fl reiziy associated with. Suid trunkund iuisxncd to conA ncrt one saisie of @nid fiom-"e oi' current to thetrat terminal of Suid trunk in said ecc-A oudory ,selector switch, nidrrlnv )tinted with Scifi trunk living energized when nid trunk ieconnected through seid primary Hclcctor switch with a culling line,subst-:iniinily :is described,

28. Vlo i1 telephone s wtcin. lines; nu au tonmtic primary selector:mitch: al trunk; menne for connectingr Suid trunk through Suidautomatic primary .Selector Switch to a calling one of Quid lines: :inautomatic com tinuouslv rotated :secondary Heier-lor Switch, havingivaiiing contarte connected with Suid trunk; a source of current; and arelay associated with said ,trunk` and operated upon connection of saidtrunk with a calling line, adapted to complete a path from a waitingcontact in sald secondary selector switch to one terminal of said sourceof current; and means whereby the wipers of said secondary selectorswitc may be stopped in connection with the trunk when said relay isoperated, substantially as described.

29.V In a telephone exchange system, a plurality of lines to beinterconnected, a plurality of automatic switches for effecting theinterconnection, but normally disconnected from said lines, continuouslyrotated switches for connecting'` the said automatic switches to callinglines, and an operators sender for controlling said automatic switches,said sender comprising a key board having keys or buttons arranged ingroups corresponding to the digitsof the numbers to be called, and meansfor connecting lsaid sender to any of said automatic switches.

30. In a telephone exchange system, a plurality of lines to beinterconnected, a number of trunk circuits less than the number oflines, automatic switches adapted to connect said trunk circuits tocalled lines, a plurality of operators senders for controlling saidautom tic switches, said senders being less than/,vt e number of trunks,a normally continually rotating switch for' connecting each trunk with acalling line and means for connecting the said senders to the trunks.

31. In a telephone exchange system, a plurality of lines to beinterconnected, a number of `trunk circuits less than the number oflines, automatic switches for connecting said trunk circuits with calledsubscribers lines, an operators sender for controlling said automaticswitches, normally continually rotating switches for connecting thetrunk to calling lines and means to connect said sender to said trunkcircuits.

` In a telephone exchange system, a plu- I rality of lines to beinterconnected, a plurality of automatic switches for eil'ccting theinterconnection, but normally disconnected from said lines, normallycontinually rotating switches for connectingr the said automaticswitches to calling lines, and an operators sender for controlling saidautomatic switches, said sender comprising a key board having keys orbuttons arranged in groups corresponding to the digits of the numbers tobe called, and means for connecting said sender to any of said automaticswitches.

33; In a telephone exchange system, a plurality of lines to beinterconnected, a number of trunk circuits less than the number ot'lines, automatic switches adapted to connect said trunk circuits tocalled lines, a plurality of operators senders for controlling saidautomatic switches, a continuously rotated switch, per trunk, controlledby the receiver 4hooks at the subscribers station for connecting thetrunks with the calling lines and means for connecting the said sendersto the trunks.

34. In a telephone exchange system, a plurality of lines to beinterconnected, a plurality of automatic switches for elfecting thcinterconnection. but normally disconnected from said lines. continuouslyrotated switches ,controlled by the subscribers receiver hooks forconnectingr the said automatic switches to calling lines, and anonorators sender for controlling said automatic switches, said sondercomprising a key board having keys or buttons arranged in groupscorresponding to the digits of the numbers to be called, and means toconnect said sender to any of said automatic switches.

In testimony whereof I al'lix my signature in presence of two witnesses.

EDWVARI) E. CLEMENT.

Witnesses E. EnMoNs'roN, Jr., JAMES II. Mann.

Correction nf'Letters Patent No. 1,109,618h

trunk; asource of current; and a relay assovcontact in said secondaryselector switch to "one terminal of said source of current; and

meansfwhereby the w1pers of said secondary selector switch may bestopped in connection with the trunk when said relay is operated,'substantially as described.

' 29. In a telephone exchange system, a plurality of lines to beinterconnected, a pluralsender y i It is `hereb 'certiiied that i 1914yupon lrhe application of Edward E. Clement, of Washington, i i aTelephone-Exchange Systems, an error appears ity'of automatic switchesfor effecting the interconnection, but .normally disconnected from saidlines, -continuously rotated switches for connecting the said automaticswitches to calling lines, and an operators for controlling 'saidautomatic switchessaid sender comprising a key board having keys orbuttons arranged in groups corresponding to the digitsof the numbers tobe called, and means for connecting lsaid sender to any of saidautomatic switches.

'30. I 'n a telephone exchange system, a plurality of lines to beinterconnected, a number of trunk circuits less than the number oflines, automatic switches adapted to connect said trunk circuits tocalled lines, a plurality of* operators senders for controlling saidautom tic switches, said senders being less thanft 'e number of trunks,a normally continually rotating switch forl connecting each trunk with acalling line and means for connecting the said senders to the trunks'.

A3l. In atelephone exchange system, a plurality oflines to beinterconnected, a number of trunk circuits 'less than the number oflines, automatic switches for connecting said ltrunk circuits withcalled subscribers lines, an operators sender for controlling said.autoniatic switches, normally continually rotating switches forconnecting the trunk to calling lines and means to connect said senderto saidtrunk circuits.

In a telephone exchange system, a plul nt in Columbia, foi an nnprovemein the printed specification requiring correction as follows: Page',

Alil-5i., and insert the following paragraph:

I doqnot claim broadly lie/rela t/Lefu/ndomenlal rality of lines to beinterconnected, a plurality of automatic switches for effecting theinterconnection, but normally disconnected from said lines, normallycontinually rotating switches for connecting the said automatic switchesto .calling lines, and an operators sender for controlling saidautomatic switches, said sender comprising a key board having keys orbuttons arranged in groups 'corresponding to the digits of the numbersto be called, and means for connecting said sender to any ot saidYautomatic switches.

33'. In a telephone exchange system, a plurality of lines to beinterconnected, a number of trunk ,circuits less than the number oflines., automatic switches adapted to connect said trunk circuits tocalled lines, a plurality of operators7 senders for controlling saidautomatic switches, a continuously rotated switch, per trunk, controlledby the receiver hooks at the subscribers station for connecting thetrunkswith the calling lines and means for connecting the said sendersto the trunks.

Sli. In atelephone exchange system, a plurality of lines to beinterconnected, a plurality otautomatic switches for eilecting theinterconnection, but normally disconnected from said lines, continuouslyrotated switches ,controlled by the subscribers receiver hooks forconnecting the said automatic switches to calling lines, and anoncrators sender for controlling said automatic switches, said sendercomprising akey board having keys or buttons arranged in groupscorresponding to the digits of the numbers to be called, and means toconnect said sender to any of said automatic switches.

In testimony whereof I atiix my signature ni presence of two witnesses.

E. EnMoNs'roN, Jr., JAMES II. Mann.

in Letters Patent No. 1,109,618, granted September l,

District of strike out lines features of the system dlsolosed,

'including primary andr secondary distributing means,4 as suoli, broadcla/ms to llws subject matter cmdlo the several other matters disclosedlul not claimed herein, loing contained amy oopendz'gny applicationserial No. 858,481, jlled August 25, 19111, as a continuation la parl ofserial No., 3l25,096/t`lod June 23, i -also contained 'i/n othercopmcling a V E? 1907' 383 87,4 lcd July 15, 1907 cmd 383,87o, APTZZV 07 y ,f should be resid with this correction therein that the the recordof the case in the Patent Otiice.

that the said Letters Patent same may conform to i [sulla] applicationsas follows:

1.906. 'Related claims are l Ser/al Nos. 369,201', jlled filed July 15,1907,' and It. F. WHITEHEAD, Acting Uommlssioner of Patents.

Cdrection lnfletters Patent No. 1,109,618

.1914, 'upon the application of Edward E. Clement, of

It is hereby'certifed that in Letters Patent No. 1,109,618, grantedSeptember 1, Washington, District of Columbia., for an improvement inTelephone-Exchange Systems, an error appears in -the printedspecification requiring correction as follows: Page 8, strike out linesi1-5,2., and insert the following paragraph:

I do not claim roadly herein the fundamental `featuras of the systemdisclosed, including primary anal secondary distributing meanysas suc/L,broad claimtl to this subject matter ani/tto the several ot/r 'mattersdisclosed lut not claimed fzevrein, lei'ng contained in, my copendinyapplication serial IVE). 858,481, Jled August Z5, 1.914, as acontinuation in part ofserial No., 323,09fz'led June 23, 1.906'.-'Related claims are -also contained 'im other copmdi'ng applicationsasfollows: Serial Nos. 369,201', led

April 20, 1907, 383,87@ filed .fu/y 15, m07; and 383,8?5, filed July 16,1907,- and that the said Letters Patent should be read with thiscorrection therein that the same Iilay conform to the record of the casein the Patent Oice. Signed and sealed this 22nd day of September, A. D.,1914.

t[smh] R. F. W'HITEHEAD, Acting C'ommissifmer of Patents.

